These maps are fun to look at, and very useful for research.  They do not include the addresses of the businesses, however.  The earlier one is from before The Great Depression while the other gives a glimpse of Port Huron during The Depression; there isn’t actually very much difference between the two.  As with most all images here, click on it to see the full size.  Enjoy, and please site PHAHPA when using these documents (here in photo image form).

Upper half of the July 1928 Occupancy Map: Port Huron, Mich. By Healy & Carey, Flint.

Lower half of the July 1928 Occupancy Map: Port Huron, Mich. By Healy & Carey, Flint.

Upper half of the July 1936 Occupancy Map: Port Huron, Mich. By W.L. Cooper, Port Huron.

Lower half of the July 1936 Occupancy Map: Port Huron, Mich. By W.L. Cooper, Port Huron.